Kang Seohyun is an F-rank hunter and part-timer whose unusual mana signature makes people forget him almost as soon as they meet him.

His only skill, Observation, lets him see what people truly crave.

It turns out that's surprisingly useful.

After calming a rampaging Minotaur with nothing but convenience-store food, Seohyun catches the attention of Han Dohwa, a powerful Elf who runs a tea house. Before long, he's juggling shifts between her café and a mysterious bar called Guiheo, run by a Progenitor Vampire.

S-rank hunters, mob bosses, and non-human customers all come looking for something only Seohyun seems able to provide: exactly the food or drink they need.

He thinks he's just doing a part-time job.

For some reason, the people he serves keep getting attached to him.